Waldseemüller map

The Waldseemüller map or Universalis Cosmographia ("Universal Cosmography") is a printed wall map of the world by the German cartographer Martin Waldseemüller, originally published in April 1507. It is known as the first map to use the name "America". The name America is placed on South America on the main map. As explained in Cosmographiae Introductio, the name was bestowed in honor of the Italian Amerigo Vespucci. The map also was first to depict the Americas as a distinct landmass clearly separated from Asia by the Pacific Ocean.

The map is drafted on a modification of Ptolemy's second projection, expanded to accommodate the Americas and the high latitudes. A single copy of the map survives, presently housed at the Library of Congress in Washington, D.C.

Waldseemüller also created globe gores, printed maps designed to be cut out and pasted onto spheres to form globes of the Earth. The wall map, and his globe gores of the same date, depict the American continents in two pieces. These depictions differ from the small inset map in the top border of the wall map, which shows the two American continents joined by an isthmus.

The map was meant to document and update new geographical knowledge from the discoveries of the last years of the fifteenth and the first years of the sixteenth centuries. It consists of twelve sections printed from woodcuts measuring 18 by 24.5 inches (46 cm × 62 cm). Each section is one of four horizontally and three vertically, when assembled. The map uses a modified Ptolemaic map projection with curved meridians to depict the entire surface of the Earth. In the upper-mid part of the main map there is inset another, miniature world map representing to some extent an alternative view of the world.

Longitudes, which were difficult to determine at the time, are given in terms of degrees east from the Fortunate Islands (considered by Claudius Ptolemy as the westernmost known land) which Waldseemüller locates at the Canary Islands. The longitudes of eastern Asian places are too great. Latitudes, which were easy to determine, are also quite far off. For example, "Serraleona" (Sierra Leone, true latitude about 9°N) is placed south of the equator, and the Cape of Good Hope (true latitude 35°S) is placed at 50°S.

The full title of the map is Universalis cosmographia secundum Ptholomaei traditionem et Americi Vespucii aliorumque lustrationes (The Universal Cosmography according to the Tradition of Ptolemy and the Discoveries of Amerigo Vespucci and others). One of the others was Christopher Columbus. The title signalled his intention to combine or harmonize in a unified cosmographic depiction the traditional Ptolemaic geography of Europe, Asia and Africa with the new geographical information provided by Amerigo Vespucci and his fellow discoverers of lands in the western hemisphere. He explained: "In designing the sheets of our world-map we have not followed Ptolemy in every respect, particularly as regards the new lands ... We have therefore followed, on the flat map, Ptolemy, except for the new lands and some other things, but on the solid globe, which accompanies the flat map, the description of Amerigo that is appended hereto."

Several earlier maps are believed to be sources, chiefly those based on the Geography (Ptolemy) and the Caveri planisphere and others similar to those of Henricus Martellus or Martin Behaim. The Caribbean and what appears to be Florida were depicted on two earlier charts, the Cantino map, smuggled from Portugal to Italy in 1502 showing details known in 1500, and the Caverio map, drawn c. 1503–1506 and showing the Gulf of Mexico.

While some maps after 1500 show, with ambiguity, an eastern coastline for Asia distinct from the Americas, the Waldseemüller map apparently indicates the existence of a new ocean between the trans-Atlantic regions of the Spanish discoveries and the Asia of Ptolemy and Marco Polo as exhibited on the 1492 Behaim globe. The first historical records of Europeans to set eyes on this ocean, the Pacific, are recorded as Vasco Núñez de Balboa in 1513. That is five to six years after Waldseemüller made his map. In addition, the map apparently predicts the width of South America at certain latitudes to within 70 miles. However, as pointed out by E.G. Ravenstein, this is an illusory effect of the cordiform projection used by Waldseemüller, for when the map is laid out on a more familiar equirectangular projection and compared with others of the period also set out on that same projection there is little difference between them: this is particularly evident when the comparison is made with Johannes Schöner's 1515 globe.